/*
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Copyright (c) 1994-1996 NeXT Software, Inc. All rights reserved.
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*//*
* 1995-06-28 dreece Created
* 2002-03-05 dreece I/O Kit port, based on drvISASerialPort:queue_primatives.m.
*/
#ifndef_APPLEPCI16X50QUEUE_H
#define_APPLEPCI16X50QUEUE_H
#include"Apple16X50Serial.h"
#include<IOKit/serial/IOSerialStreamSync.h>
#defineBIGGEST_EVENT ((UInt32)3)
#defineQUEUE_SIZE_MINIMUM ((UInt32)64)
#defineQUEUE_SIZE_DEFAULT ((UInt32)2048)
#defineQUEUE_SIZE_MAXIMUM ((UInt32)32768)
enum tQueueState {
kQueueEmpty = (PD_S_TXQ_EMPTY | PD_S_TXQ_LOW_WATER), // 0 events in queue
kQueueLow = PD_S_TXQ_LOW_WATER, // 1..(LowWater-1) events in queue
kQueueMedium = 0, // LowWater..(HighWater-1) events in queue
kQueueHigh = PD_S_TXQ_HIGH_WATER, // HighWater..(Size-1) events in queue
kQueueFull = (PD_S_TXQ_HIGH_WATER | PD_S_TXQ_FULL) // Size events in queue
};
enum tDirection { kRxQ, kTxQ };
class Apple16X50Queue
{
public:
Apple16X50Queue(tDirection dir); // constructor
~Apple16X50Queue(); // destructor
UInt32 HighWater; // high water mark in chars
UInt32 LowWater; // low water mark in chars
UInt32 Size; // maximum number of chars in queue
UInt32 Count; // current number of chars in queue
void setSize(UInt32 size=QUEUE_SIZE_DEFAULT);
void setLowWater(UInt32 low=0);
void setHighWater(UInt32 high=0);
inline bool enqueueThresholdExceeded() { return (Count > EnqueueThreshold); };
inline bool dequeueThresholdExceeded() { return (Count < DequeueThreshold); };
void flush();
tQueueState getState();
void enqueueEvent(UInt8 event, UInt32 data=0);
bool enqueueEventTry(UInt8 event, UInt32 data=0);
UInt8 dequeueEvent(UInt32 *datap=NULL);
UInt8 peekEvent(UInt32 depth=0);
private:
UInt32 EnqueueIndex; // ptr to next enqueue element
UInt32 DequeueIndex; // ptr to next dequeue element
UInt32 EnqueueThreshold; // enqueue threshold
UInt32 DequeueThreshold; // dequeue threshold
UInt16 *Queue; // actual array of events;
char *Name;
bool OverRun; // if true then enqueues have failed
inline void pushWord(UInt16 data);
inline UInt16 pullWord();
};
#endif // _APPLEPCI16X50QUEUE_H